Map List In Javascript

The javascript map values()method returns an object of new mapiterator. List of functions you can perform with the array.map () function are: And, fyi, this really should have been on stack overflow, so it'll probably be moved anways.

Start from the function above. When we iterate over the map object it returns the key, value pair in the same order as inserted. Mapiterator {a, b, c} the map.keys() method is used to extract the keys from a given map object and return the iterator object of keys.the keys are returned in the order they were inserted.

The method accepts a callback function, which takes the currentvalue, index, and the return array as arguments, providing a new array as output:

Understanding map () in javascript in simple words, the map () method creates a new array from an existing array. Let map = new map ( [iterable]); The method accepts a callback function, which takes the currentvalue, index, and the return array as arguments, providing a new array as output: Mapobj.values() parameter a new object of map iterator.